Overall, well, good
To sum up, this is relatively good way to bring champion up-to-date, but:
Versatile Training - I do not know why would you increase skill bonus by 1.5 proficiency. Either double the proficiency or scrap this part at all, even without it 3rd level is very strong now.
Remarkable Athlete - as above, one more skill and one expertise would be ...
The Echo is Tangible.
Crawford's tweet states that the Echo is an object. Objects are by default tangible. No one argues whether a table or painting or sword is tangible, do they? The ability description also explicitly states:
"(The Echo) is the same size as you, and it occupies its space"
It is in effect a gray, translucent, tangible shade ...